/*
 * Copyright (C) 2020, TIBCO Software Inc.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 *
 * 3. Neither the name of the copyright holder nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

package com.tibco.ep.sb.services;

import com.tibco.ep.sb.services.build.IRuntimeBuildService;
import com.tibco.ep.sb.services.management.IRuntimeAdminService;

import java.util.ServiceLoader;

/**
 * Primary access point for runtime services
 */
public class RuntimeServices {
    private RuntimeServices() {
        //  Never called.
    }

    private static <T> T getRuntimeService(Class<T> cls, ClassLoader classLoader) {

        //  Get a service implementation. There should be only one.
        //
        T service = null;

        for (T s : ServiceLoader.load(cls, classLoader)) {

            if (service != null) {
                throw new IllegalStateException("Cannot have multiple "
                    + cls + " service implementations.");
            }

            service = s;
        }

        return service;
    }

    /**
     * Get the administration service
     *
     * @param classLoader The class loader
     * @return The administration service
     */
    public static IRuntimeAdminService getAdminService(ClassLoader classLoader) {
        return getRuntimeService(IRuntimeAdminService.class, classLoader);
    }

    /**
     * Get the build service
     *
     * @param classLoader The class loader
     * @return The build service
     */
    public static IRuntimeBuildService getBuildService(ClassLoader classLoader) {
        return getRuntimeService(IRuntimeBuildService.class, classLoader);
    }
}
